For Loop Practice

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For Loop Practice Problems

PART1
What is returned for each of these codes when the call loop (10) is made?

How many times did the loop execute?

1)
public int loop (int x)
{
int sum = 0;
for ( int i = 0; i < x; i++)
{
sum += i;
}
return sum;
}

2)
public int loop (int x)
{
int sum = 0;
for ( int i = 3; i < x ; i ++)
{
sum += i ;
}
return sum;
}

3)
public int loop (int x)
{
int sum = 0;
for ( int = 0; i < x; i ++)
{
sum += i;
i++;
}
return sum;
}

4)
public int loop (int x)
{
int sum = 0;
for (int i = 20; i > x; i --)
{
sum -= i;
}
return sum;
}

5)
public int loop (int x)
{
int i = 0, sum = 1;
for ( ; i <x; i += 2)
{
sum *= i;
}
return sum;
}

6)
public int loop (int x)
{
int sum = 0;
for (int i = 0; i < x; i++)
{
if ( i % 2 == 0)
sum ++;
else
sum *= 2;
}
return sum;
}

7)
public int loop (int x)
{
int sum = 0;
for ( int i = 1; i < x; i ++)
{
if (i % 5 ==0)
return sum;
else
sum +=i;
}
return sum;
}

8)
public int loop (int x)
{
int sum = 0;
for (int i = 0; i < x; i++)
{
x --;
sum += i + x;
}
return sum;
}

PART 2

1.) What is the output of the following program fragment?
for ( int j = 10;  j >  5; j-- )
{
  System.out.print( j + " " );
}
System.out.println( );
 

2.)What is the output of the following program fragment?
for ( int j = 0;  j <  5; j++ )
{
  System.out.print( j + " " );
}
System.out.println( );
 

3.) What is the output?
for ( int j = 5;  j > -5; j-- )
  System.out.print( j + " " );
 
System.out.println( );
 

4.) Fill the blank so that the following fragment prints out 0.2, 0.4, 0.6, 0.8, 1.0,

for ( int j = 2; j <= 10; j+=2   )
  System.out.print( __________ + ", " );
 
System.out.println( );
 

5.) What is the output?
for ( int count=0;  count <= 9; ++count )
  System.out.print( count + " " );
 
System.out.println( );
 

6.) What is the output?
for ( int count = 0;  count <= 20;  count+=2 )
  System.out.print( count + " " );
 
System.out.println( );
 

7.) Fill in the blank so that the following adds up the odd numbers from 1 to 99
int sum = 0;
for ( int num = 1; num <=99; __________ )
  sum += num;
 
System.out.println( sum );
 





ANSWERS